摘要
为研究狭长受限空间内燃气燃爆灾害的演化规律,采用三维仿真软件FLACS分别建立全密闭和半密闭两种受限空间模型,对比研究了两种模型的火焰传播形态,并分析了两种模型在不同工况条件下的燃爆灾害规律。结果表明:两种模型的燃爆火焰形态显著不同;对于全密闭空间,长宽比的增大会促进火焰传播同时增大爆炸压力值的波动性,稍高于化学当量比的甲烷浓度产生的爆炸压力最大,并且富燃爆炸比贫燃爆炸的压力要高;对于半密闭空间,气云体积的增大加大了火焰传播距离的同时也提高了开口端的火焰速度,障碍物数量的增多使爆炸火焰呈现先促进后削弱的现象,并加大了最大爆炸压力和燃爆速度的变化幅度。
To study the evolution law of gas combustion and explosion disaster in narrow and long con-fined space,the three-dimensional simulation software FLACS was used to establish two confined space models,i.e.,the fully confined space model and the semi-confined space model,respectively.The flame propagation patterns of the two models were compared,and the flammability and explosion disaster law of the two models under different working conditions was analyzed.The results show that the combustion and explosion flame forms of the two models are significantly different.For fully con-fined space,the increase of aspect ratio will promote flame propagation and increase the fluctuation of explosion pressure value.The methane concentration slightly higher than the chemical equivalent ratio produces the maximum explosion pressure,and the pressure of rich combustion explosion is higher than that of lean combustion explosion.For semi-confined space,the increase of gas cloud volume in-creases the flame propagation distance and the flame velocity at the open end.The addition of obsta-cles initially enhances and then diminishes the intensity of the explosion flame,leading to a broader range of maximum explosion pressures and velocities.The analysis results of this study offer valuable insights for preventing and controling urban gas explosion risks in narrow and long confined spaces.
作者
金友平
帅健
王旭
张圣柱
王如君
多英全
JIN Youping;SHUAI Jian;WANG Xu;ZHANG Shengzhu;WANG Rujun;DUOYingquan(College of Safety and Ocean Engineering,China University of Petroleum(Beijing),Beijing 102249,China;Shenzhen Gas Corporation Ltd,Shenzhen 518049,China;China Academy of Safety Science and Technology,Beijing 100012,China)
出处
《防灾减灾工程学报》
CSCD
北大核心
2023年第6期1366-1376,共11页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家重点研发计划(2022YFC3070100)
国家自然科学基金(51806247)
中国石油大学(北京)科研基金(2462022YXZZ002)资助。
关键词
狭长受限空间
FLACS
燃气
火焰传播
燃爆灾害
爆炸压力
long-narrow confined space
FLACS
gas
flame propagation
explosion disasters
explo-sion pressure
作者简介
金友平(1996-),男,硕士研究生。主要从事城镇燃气泄漏后果研究。E-mail:jinyouping2@163.com;通讯作者:帅健(1963-),男,教授,博士。主要从事油气管道安全管理方面的研究。E-mail:shuaij@cup.edu.cn。
